I read on the compatibility page that Macintosh music in SCI games may have glitches. Indeed, when I tested King's Quest V in ScummVM and SheepShaver, the former definitely has some quirks and sounds a bit "off".

I was wondering if anyone can elaborate on why this is the case, and could it potentially be adresssd sometime in the forseeable future?

It is arguable that the MT-32 soundtracks in the PC versions of Sierra games are superior, but in my opinion the Macintosh versions do have their particular distinctiveness and charm.

This error does not occur in ScummVM 1.9 but of course the sound is 'buggy' as mentioned above.

I'm happy though because I was never into the LL games. I look forward to future releases that might end up supporting the Mac versions of King's Quest VI and VII .. and hopefully also incorporating waltervn's excellent work on the SCI sound code.

*update* Looks like King's Quest VI works too. The ScummVM compatibility page may need some editing because it currently lists only the PC and Amiga versions as being supported.